2022-08-24 13:53:18 +00:00
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#lang scribble/manual
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@(require (for-label racket))
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2022-08-28 10:27:01 +00:00
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@title{poll}
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@racketblock[
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2022-08-24 13:53:18 +00:00
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(with-sc3
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(lambda (fd)
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(letrec ((print (lambda (e) (display e) (newline)))
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(showing (lambda (f) (lambda () (let ((v (f))) (print v) v))))
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(repeat (lambda (f) (if (f) (repeat f) #f))))
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(async fd (notify 1))
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(repeat (showing (lambda () (wait fd "/tr"))))
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2022-08-28 10:27:01 +00:00
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(async fd (notify 0)))))
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]
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2022-08-24 13:53:18 +00:00
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